Fastener



FIG. 1 is a perspective view of the fastener;

FIG. 2 is a front view of the fastener;

FIG. 3 is a back view of the fastener;

FIG. 4 is a left side view of the fastener;

FIG. 5 is a right side view of the fastener;

FIG. 6 is a top view of the fastener; and,

FIG. 7 is a bottom view of the fastener.

The broken lines in the drawings illustration portions of the fastenerand form no part of the claimed design.

CLAIM The ornamental design of a fastener, as shown and described.